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ChemistryNEET 2024Entropy and Gibbs energy, spontaneity

Thermodynamics

In which of the following processes does entropy increase?

A. A liquid evaporates to vapour.

B. The temperature of a crystalline solid is lowered from 130 K to 0 K.

C.

D.

Choose the correct answer from the options given below:

  1. A.A, B and D
  2. B.A, C and D✓
  3. C.C and D
  4. D.A and C

Solution

Entropy rises when disorder rises: liquid → vapour (A), a solid giving two gases (C), and one gas molecule becoming two (D). Cooling a crystal towards 0 K lowers entropy (B). So A, C and D.

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